Template:Ekanite

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Ekanite
Chemical composition ThCa2Si8O20
Crystal system Tetragonal
Habit Elongated, pebbles.
Cleavage None
Hardness 6 - 6.5
Optic nature Uniaxial -
Refractive index 1.560 - 1.596
Birefringence 0.001-0.008
Dispersion Low
Specific gravity 3.28
Lustre Vitreous